The following is a proposed revision to NSF/ANSI 61 establishing “intermittent” and
“continuous” hot water evaluation options for mechanical devices identical to Section 4.
B.4 Mechanical devices
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B.4.3 Conditioning
Conditioning shall be conducted either in the device or in a vessel. Table B7 provides examples of typical
exposures for the various products covered by this section. The test samples shall be conditioned in
accordance with 4.5.5 for single time point evaluations and 4.5.7 for multiple time point evaluations.
preconditioned by exposure at room temperature 23 ± 2 °C (73 ± 4 °F) to the extraction water used for
testing (annex B, section B.2.5) for 14 d or less if specified by the manufacturer. The water shall be
changed at least 10 times (during the 14-d conditioning period), or fewer if specified by the manufacturer.
There shall be a minimum period of 24 h per exposure.
B.4.4 Exposure
B.4.4.1 In-line device samples
After conditioning, the samples shall be exposed as described in annex B, table B7 in the appropriate
extraction media (annex B, section B.2.5). Samples shall be exposed in accordance with 4.5.6 for single
time point evaluations and 4.5.7 for multiple time point evaluations with the exception of using Table B.8
in lieu of Table 4.2. Devices/components that in actual field use are not used with hot water shall be
exposed using the sequence shown in annex B, table B8. Devices/components that are used in contact
with water at a temperature in excess of 23 °C (73 °F) shall be exposed using the same exposure
sequence, at the maximum temperature encountered under use conditions. At the conclusion of each of
the first two exposure periods defined in annex B, table B8, the extractant water shall be discarded. The
test sample or exposure vessel shall then be refilled with exposure water, and the exposure continued. At
the conclusion of the third exposure period, the The extraction media water shall be collected for analysis
as described in annex B, section B.6.
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B.4.4.4 Other mechanical devices
After conditioning, other mechanical devices shall be exposed using the appropriate extraction media
(annex B, section B.2.5) as indicated in annex B, table B7. Samples shall be exposed in accordance with
4.5.6 for single time point evaluations and 4.5.7 for multiple time point evaluations with the exception of
using Table B.9 in lieu of Table 4.2. Devices that in actual field use are not used with hot water (e. g.,
distribution system valves), shall be exposed using the sequence shown in annex B, table B9. At the
conclusion of each of the first two exposure periods defined in annex B, table B9, the extractant water
shall be discarded. The test sample or exposure vessel shall then be refilled with exposure water, and the
exposure continued. At the conclusion of the third exposure period, the The extraction media water shall
be collected for analysis as described in annex B, section B.6.
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Table B8 – In-line device exposure sequence
Temperature
23 ± 2 C (73 ± 4 F)
23 ± 2 C (73 ± 4 F)
23 ± 2 C (73 ± 4 F)
1
In-line device exposure time
24 h
24 h
12 to 16 h
Elapsed time1 in-line devices
24 h
48 h
60 to 64 h
Elapsed time does not include the initial 14-d conditioning period.
Reason: Temperatures are specified in section referring this table
Table B9 – Other mechanical device exposure sequence
Temperature
23 ± 2°C (73 ± 4°F)
23 ± 2°C (73 ± 4°F)
23 ± 2°C (73 ± 4°F)
1
Exposure time
other mechanical devices
24 h
24 h
24 h
Elapsed time does not include the initial 14-day conditioning period.
Reason: Temperatures are specified in section referring this table
Page 2 of 2
Elapsed time
other mechanical devices
24 h
48 h
72 h